void QwtPlotItem::updateLegend(QwtLegend *legend) const
{
if ( !legend )
return;
QWidget *lgdItem = legend->find(this);
if ( testItemAttribute(QwtPlotItem::Legend) )
{
if ( lgdItem == NULL )
{
lgdItem = legendItem();
if ( lgdItem )
{
if ( lgdItem->inherits("QwtLegendItem") )
{
QwtLegendItem *label = (QwtLegendItem *)lgdItem;
label->setItemMode(legend->itemMode());
if ( d_data->plot )
{
QObject::connect(label, SIGNAL(clicked()),
d_data->plot, SLOT(legendItemClicked()));
QObject::connect(label, SIGNAL(checked(bool)),
d_data->plot, SLOT(legendItemChecked(bool)));
}
}
legend->insert(this, lgdItem);
}
/*!
\brief Allocate the widget that represents the item on the legend
The default implementation returns a QwtLegendItem(), but an item
could be represented by any type of widget,
by overloading legendItem() and updateLegend().
\return QwtLegendItem()
\sa updateLegend() QwtLegend()
*/
QWidget *QwtPlotItem::legendItem() const
{
QwtLegendItem *item = new QwtLegendItem;
if ( d_data->plot )
{
QObject::connect( item, SIGNAL( clicked() ),
d_data->plot, SLOT( legendItemClicked() ) );
QObject::connect( item, SIGNAL( checked( bool ) ),
d_data->plot, SLOT( legendItemChecked( bool ) ) );
}
QWidget* PlotMarkerLegend::legendItem() const
{
LegendItem* item = new LegendItem;
if(plot())
{
QObject::connect(item, SIGNAL(clicked()), plot(), SLOT(legendItemClicked()));
QObject::connect(item, SIGNAL(checked(bool)), plot(), SLOT(legendItemChecked(bool)));
}
return item;
}
